/*
 * Copyright 2013-2018 Ray Tsang
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jdeferred2;

/**
 * A callback invoked when the {@code Promise}'s state becomes {@link Promise.State#REJECTED}.
 *
 * @param <F> Type used for {@link Deferred#reject(Object)}
 *
 * @author Ray Tsang
 * @see Deferred#reject(Object)
 * @see Promise#fail(FailCallback)
 */
public interface FailCallback<F> {
	void onFail(final F result);
}
